DFI NP905-B16C - Manual (Page 54)

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3
BIOS Setup
USB Keyboard Function
Due to the limited space of the BIOS ROM, the support for legacy
USB keyboard (in DOS mode) is by default set to Disabled. With
more BIOS ROM space available, it will be able to support more
advanced features as well as provide compatibility to a wide variety
of peripheral devices.
If a PS/2 keyboard is not available and you need to use a USB
keyboard to install Windows (installation is performed in DOS
mode) or run any program under DOS, set this field to Enabled.
USB Mouse Function
Due to the limited space of the BIOS ROM, the support for legacy
USB mouse (in DOS mode) is by default set to Disabled. With
more BIOS ROM space available, it will be able to support more
advanced features as well as provide compatibility to a wide variety
of peripheral devices.
If a PS/2 mouse is not available and you need to use a USB mouse
to install Windows (installation is performed in DOS mode) or run
any program under DOS, set this field to Enabled.
USB Storage Function
This field is used to enable or disable the support for legacy USB
mass storage.